JPS61138138A - Device for displaying correcting of unbalance of rotating working body - Google Patents

Abstract

PURPOSE:To make effective the correcting of unbalance of a rotating working body (grindstone) by calculating the weight quantity to correct the unbalance of the rotating working body by a calculating means and displaying its quantity on a displaying means by a controlling means. CONSTITUTION:An origin setting means consisting of a projecting piece formed to a supporting shaft of a grinder and an origin detecting sensor is provided and a display device 10 having a dividing position indicating body 13, an origin display body 14, a weight display body 15 and a HOLD display body 16 is fixed to the frame. Then, a power source switch 11 is made on and the runout quantity of the grindstone is converted and controlled by a control circuit and the weight for every set number of rotations with the stability of rotation of the grindstone is lighted on the weight display body 15 and the angle position which is the correcting position is lighted on the dividing position indicating body 13 respectively. Further, when the balance of the grindstone is taken, the display to that effect is made on the weight display body 15.

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) This invention relates to an unbalance correction display device for a rotary workpiece.

(Prior Art) Conventionally, this type of unbalance correction display device has not been found.

(Problems to be Solved by the Invention) The present invention aims to improve the efficiency of unbalance correction by providing a display that automatically calculates and displays the amount of weight used for correction. do.

Structure of the Invention (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides an origin setting means for setting the origin in the rotational direction of the rotary workpiece, and a plurality of indexing positions based on the origin. An indexing position indicator for instructing, a detection means for detecting vibrations of a rotary workpiece held at a plurality of indexing positions, a calculation means for performing calculations based on vibrations at the plurality of indexing positions, and displaying the calculation results. display means, and control means for calculating the amount of weight for correcting the unbalance of the rotary workpiece in the calculation means and displaying the amount of weight on the display means.

(Function) Now, when the rotary workpiece of a machine tool is rotated, the machine base vibrates due to the vibration of the rotary workpiece. In this state, the origin setting means sets the origin in the rotational direction of the rotary workpiece,
The detection means detects the amount of runout at each index position with respect to the origin in the rotational direction. Then, the calculation means converts the swing amount into the amount of weight, and the control means displays the amount of weight on the display means.

(Example) Hereinafter, an example in which the present invention is embodied in a surface grinder will be described based on the drawings.

As shown in FIG. 1, a table 2 for holding a work W is provided on a frame 1 of a grinding machine. A support shaft 4 shown in FIG. 2 is rotatably mounted on the table 2, and a grindstone 3 is fixed to the tip thereof so as to face the workpiece W on the table 2 from above. Support shaft 4
A motor 6 for driving the support shaft 4 is disposed behind the support shaft 4 .

A piezoelectric acceleration pickup 5 is attached to the upper column 1a of the frame 1. Further, as shown in FIG. 2, a detection piece 7 is provided protruding from the outer periphery of the base end of the support shaft 4, and a photointerrupter 9 is mounted on the frame 1 outside the base end of the support shaft 4. A detection sensor 8 is provided and outputs an origin detection signal each time the detection piece 7 passes through this portion.

Note that the frame 1 includes all parts except the part rotated by the motor 6. Further, the acceleration pink-up 5 has a magnet (not shown), and is attracted to a part of the frame 1 by the magnet. Therefore, the mounting position of the acceleration pickup 5 can be freely changed.

A display 10 is arranged and fixed on the outside of the frame 1, and a power switch 11 is provided on the side surface of the display 10 for turning on and off the balance detection device of this embodiment.

As shown in FIG. 3, the front surface of the display unit 10 is a display section 12, and the display section 12 shows a total of 36 index positions for each 10 degree rotation angle, corresponding to each index position of the grindstone 3. Indicators 13 are arranged in a ring. Each indexing position indicator 13 has a built-in red light emitting diode. Further, an origin indicator 14 having a built-in light emitting diode is arranged to correspond to the angular position indexing position indicator 13 from which the origin detection sensor 8 outputs a signal.

Inside the ring of the indexing position indicator 13 is a weight display section 1 that displays the weight of a weight for correcting the unbalanced state of the grindstone 3.
5 is provided, and a hold display body 16 containing a light emitting diode is also provided within the ring of the indicator 13 to indicate a display hold state. Further, the weight display section 15 displays a numerical value for one character based on the blinking of seven liquid crystal segments.

Note that a hold switch 17 for holding the display is provided on the upper right side of the display section I2.

FIG. 4 shows a block diagram of the balance detection device in this embodiment, and the central processing unit (hereinafter referred to as CPU)
An input/output boat (hereinafter referred to as 10) 21 is connected to 20, and an input/output device to be described later is connected via this 11021. The input/output devices include a piezoelectric acceleration pickup 5 that detects vibrations of the machine base via a filter circuit 24, the origin detection sensor 8, and a hold switch 17 as a human power device, and an indexing position indicator 13 as an output device.
Origin indicator 14, weight indicator 15, hold indicator 16
is connected. Further, a read only memory (hereinafter referred to as ROM) 22 and a random access memory (hereinafter referred to as RAM) 23 are connected to the CPU 20, and RO
A program is stored in M22, and a data area for storing data is provided in RAM23.゛The filter circuit 24 shown in FIG.
A charge amplification circuit 30 that converts the charge into the acceleration signal SGI. Voltage amplification circuit 3 that adjusts vibration sensitivity using variable resistor R1
1. Bandpass filters (B, P, F) that are adjusted to synchronize with the vibration of the grindstone 3.

)32. Integrating circuit 33 for converting acceleration signal SGI into speed signal SG2. A voltage amplification circuit 34 that adjusts the amplification factor of the speed signal SG2 is connected in this order.

The A/D comparator 27 then outputs the speed signal SG.
2 is converted into a digital signal.

The operation of the unbalance correction display device configured as above will be explained with reference to the flowchart of FIG. 5. The program in this flowchart proceeds under the control of the CPU 20.

Now, with the rotating grindstone 3 attached to the support shaft 4, the motor 6
, and rotate the support shaft 4 and the rotary grindstone 3. When the power switch 11 is turned on in this state, step S1
Initial settings are made in step S2, and in step S2, the grinding wheel 3
A determination is made as to whether or not the rotation has reached steady rotation. At this time, the determination is made by measuring the pulse interval of the origin detection pulse output from the origin detection sensor 8, storing the data in the pulse interval area of the RAM 23 for the specified number of rotations, and storing the data within the next specified number of rotations. are compared by the CPU 20, and if they are approximately the same pulse interval, the process moves to the next step S3. If the pulse interval data does not fail, the count is restarted from the beginning. In step S3, the process waits for the origin signal from the origin detection sensor 8 to be output, and at the same time as the origin signal is output, the process proceeds to step S4.

In steps 34 to S7, while the grinding wheel 3 rotates once, the A/
The runout amount data D of the rotary grindstone 3 that can be processed by the D converter 27 is stored in the RAM 23, and the process proceeds to step S8 at the same time as one rotation of the grindstone 3 is completed.

In this step S8, the detected shake amount data D is converted into shake amount data Dn every 10 degrees by the total number of shake amount data D.
In step S9, the runout amount data Dn divided into 10 degrees are calculated as data for each index position, and the sum for each index position is calculated, and averaged data Sn is calculated from the data number. Step S1
0, the data S averaged for each index position.
Store n in RAM23. And step Sll
Then, it is determined whether or not the set number of revolutions has been repeated. If it has been repeated, the process advances to the next step 312; if not, the process returns to step S2 and the steps are continued until the set number of revolutions is reached.
Repeat knobs 32-Sll.

In step S12, the average data Sn at each indexed position is read from the RAM 23, the average data Sn for the set number of rotations is added for each indexed position, and the average data Yn is calculated for each indexed position from the set number of rotations. In step S13, the average data Yn is stored in the RAM2.
Store in 3.

Steps 514 to S16 are performed within the specified rotation speed of the grindstone 3. In step S14, the minimum shake amount and each index position (hereinafter referred to as angle) are selected by comparing the average data Yn, and in step S15, minimum shake range angle position setting and weight conversion are performed. This minimum runout range angular position setting means setting a tolerance range that includes the minimum value of the minimum runout amount, and selecting an angle of the runout amount that is included in the tolerance range. Moreover, weight conversion means converting the amount of runout at the angular position selected in the minimum runout range angular position setting into the amount of weight that corrects the imbalance of the grindstone. In other words, the corrected position and its weight are calculated.

In step 316, it is determined whether or not the minimum runout amount obtained in step S14 is below a reference value. If it is not below the reference value, the process proceeds to step S17; When it is determined that the balance has been achieved, the process proceeds to step S19, where "good" is displayed on the weight display 15 as a signal that the balancing has been completed.

In step S17, the weight determined in step 315 and its swing range angular position are displayed on the display unit 12, and in step S18, when the hold switch 17 is turned on, the display state is maintained, and a hold display indicating the maintained state is displayed. 16 is turned on. When the hold switch 17 is off, the process returns to step S2 and the above-described correction display operation is repeated again.

Next, the display state of the display 10 will be explained. power switch 1
1 is turned on, "-1111" is displayed on each digit of the weight display section 15 until the rotational speed becomes stable. Then, as the rotation of the whetstone 3 stabilizes, the weight indicator 15
In step 517), the indexing position indicator 13 lights up the light emitting diode at the angular position that is the corrected position. Then, when the rotary grindstone 3 is balanced, the weight display 15 shows "g o o d,"
Display.

The origin indicator 14 lights up when the grindstone 3 passes the origin.

In this way, after turning on the hold switch and stopping the rotation of the grindstone, first rotate the grindstone by hand until the origin indicator lights up. Then, in this state, the correction position can be read, the weight can be attached, and the correction work can be easily performed.

Note that this invention is not limited to the above-described embodiments, and may be modified without departing from the spirit of the invention, such as keeping the weight of the weight to be corrected constant and displaying the number of the weights on the weight display section. It's okay.

Effects of the Invention As described in detail above, the present invention displays the unbalanced state of the rotary workpiece in a maintained state, so it exhibits the effect that correction work for the rotary workpiece can be easily performed.

[Brief explanation of the drawing]

Figure 1 is a schematic side view of a grinding machine with an unbalance correction display device installed, Figure 2 is a partial sectional view of the support shaft, and Figure 3 is a partial cross-sectional view of the support shaft.
The figure is a front view of the display, FIG. 4 is a block diagram of the control means,
FIG. 5 is a block diagram of the Haruwa circuit, and FIG. 6 is a flowchart showing the display operation. 3 is a rotating workpiece, 4 is a support shaft, 6 is a motor, 8 is an origin setting means, 10 is a display means, 13 is an indexing position indicator, 2
0 is a control means. Patent applicant Nagase Iron Works Co., Ltd. Agent Patent attorney On 1) Hironobu Figure 2

Claims (1)

[Claims] 1. A machine tool comprising a support shaft (4) rotated by a motor (6) and a rotary workpiece (3) attached to the support shaft (4), wherein the rotary workpiece (3) an origin setting means (8) for setting the rotational direction origin; an indexing position indicator (13) for indicating a plurality of indexing positions based on the origin; and a rotary workpiece (3) at a plurality of indexing positions. ); a calculation means (20) that performs calculations based on vibrations at a plurality of indexed positions; and display means (10) that displays the calculation results; Rotation characterized by comprising a control means (20) for calculating the amount of weight to correct the unbalance of the rotary workpiece (3) in (20) and displaying the amount of weight on the display means (10). Body imbalance correction display device. 2. The unbalance correction display device for a rotary workpiece according to claim 1, wherein the display means (10) displays the number of weights of a required weight or the weight of the weights.